Getting Started
Install Theme UI.
npm i theme-ui
Create a theme object to include custom color, typography, and layout values.
// example theme.jsexport default {fonts: {body: 'system-ui, sans-serif',heading: '"Avenir Next", sans-serif',monospace: 'Menlo, monospace',},colors: {text: '#000',background: '#fff',primary: '#33e',},}
Add the theme to your application with the ThemeProvider
, passing in the theme
object as a prop.
// basic usageimport { ThemeProvider } from 'theme-ui'import theme from './theme'export default (props) => (<ThemeProvider theme={theme}>{props.children}</ThemeProvider>)
sx
prop
Use the sx
prop throughout your application to add styles based on your theme to any component.
Enable the sx
prop by adding the /** @jsxImportSource theme-ui */
comment to the top of your file.
The sx
prop lets you add any valid CSS to an element,
while using values from your theme to keep styles consistent.
You can think of the style object that the sx
prop accepts as a superset of CSS.
/** @jsxImportSource theme-ui */export default (props) => (<divsx={{fontWeight: 'bold',fontSize: 4, // picks up value from `theme.fontSizes[4]`color: 'primary', // picks up value from `theme.colors.primary`}}>Hello</div>)
Classic JSX runtime
If you use the classic JSX runtime, the the /** @jsxImportSource theme-ui */
comment has no effect.
In this case enable the sx
prop by adding the /** @jsx jsx */
comment instead and importing jsx
from Theme UI.
/** @jsx jsx */import { jsx } from 'theme-ui'
Responsive styles
The sx
prop also supports using arrays as values to change properties responsively with a mobile-first approach.
/** @jsxImportSource theme-ui */export default (props) => (<divsx={{// applies width 100% to all viewport widths,// width 50% above the first breakpoint,// and 25% above the next breakpointwidth: ['100%', '50%', '25%'],}}/>)
If you prefer standard CSS syntax, you can use nested objects for responsive styles as well.
<divsx={{width: '100%','@media screen and (min-width: 40em)': {width: '50%',},}}/>
Components
Theme UI includes a library of primitive UI components, which can be completely customized with your theme and include support for variants. You can use variants to encapsulate more complex, component-specific styles that can be changed with props. Import and use these components to handle layout, images, forms, and more.
/** @jsxImportSource theme-ui */import { Box, Label, Input, Button } from 'theme-ui'export default (props) => (<Box sx={{ mb: 4 }}><Label htmlFor="search">Search</Label><Input id="search" name="search" {...props} /><Button>Go</Button></Box>)
See the Components documentation for more.
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